My home inspection of Speedmaster heads
OK, doing some quick easy checks now that I actually have my rocker assemblies in hand. Looking at just the hold down bolts and thread engagement into the heli-coiled rocker stands, this is basic knowledge to most I'm sure: Factory hold down bolts extend 20mm from the bottom of the shafts. The rocker stands heli-coils start 10mm below the saddles. You only get 10mm (6-7 threads) of bolt engagement. The heli-coils offer approx. 22mm of thread engagement. Doing the math we're leaving an additional 12mm of unused thread engagement. So, I don't know about you, but as tolene56 mentioned, I too will be using studs that engage every bit of usable threads in the stands. Running with 10mm of engagement? No way, never.
OK, doing some quick easy checks now that I actually have my rocker assemblies in hand. Looking at just the hold down bolts and thread engagement into the heli-coiled rocker stands, this is basic knowledge to most I'm sure: Factory hold down bolts extend 20mm from the bottom of the shafts. The rocker stands heli-coils start 10mm below the saddles. You only get 10mm (6-7 threads) of bolt engagement. The heli-coils offer approx. 22mm of thread engagement. Doing the math we're leaving an additional 12mm of unused thread engagement. So, I don't know about you, but as tolene56 mentioned, I too will be using studs that engage every bit of usable threads in the stands. Running with 10mm of engagement? No way, never.